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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d63520c451f1dca8229bc4fa5064b7273fbde7bd1988ed6c62d025da91a4139' 
  AND token = 'fPXzFufwu7zxKl8865ifMu9s/q1HeVorTf6WUbjCveg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}