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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad5337009dbbc683dd27a4e318f4183bd1b0feeabdd6c966a6cf21c9f807212a' 
  AND token = '1pJtkIpbuyS4YLELFEo9LEQSy0fV/Dh6hk3cqyj6nrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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