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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdad2b7c2542268e30d5aefbdd429fdde219eaaa519bdd617dc4a441ebf5d7fe' 
  AND token = 'WCwF/arl5FiFgC245sVVefIXqZeEfk7qgwI2X505vPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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