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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c3531befc56eaa5bdd5e2a3cc88d89fd5d54c5ff227d1d5b6c06e69713d7db' 
  AND token = '6PiYMcC4xq9pggrQJVoD6P60dnBI1dR6kJEvV9xMJ3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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