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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca11c9755a763cc33c42a99b3df7b7ae5c267dae8faf7a6fbb8918826803ad57' 
  AND token = '+TJMkfc2JDQclFJ2vG9cTvU/pC8poLo0M0yk6SfzTT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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