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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9a933ba64e29655555fa5c9b3b3a3d86c3883c14ab8f059425c142b0d87feb' 
  AND token = 'lsAAOEHOorwUhAKYR5k8dFfr1Myi5SfbdEaxW+J8UHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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