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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c83027280ce9f70ffbf159152ab759fc0df64278badbfd5c0efe2e14c16c9ff' 
  AND token = 'jalxFNkS2KHU1JyqnQoMoIQEQPgW9clxQTwv7tK9cmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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