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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c61cb82cde91f8f697edd92557eb8a74415378b93e96de5972f05dd52e2293' 
  AND token = 'Fkq9lJ/KYXob/7XvvI38isrQ44j735oiyTeR55ZT14Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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