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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ed8062fc570cb34e1af1662aefceb7b1144e49c153b75644c34e4c819c00dd' 
  AND token = 'e/fMEFdeR/93GwmzA8MF4dpg2wFSFALOGVm+wJZWLa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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