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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c196bbdf8aad34528c2f13f34ed08b9603f23719075a840f70b980fd3c3ca710' 
  AND token = 'edQfMORTDfCLv9k6n9JRoMYqiQulNNeDEN885y7o6og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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