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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f1158b2df8623bb265a4fbd8ad2c42fdaf0ea05485db59e6660ded24edc90b' 
  AND token = 'Ekf6LX8PDy4+oRgVdkSFuNlMdkLr1AUXIRzJL6K0ev4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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