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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a80454ce89674f546caf2288f1b223eedbdeb444da500f75db5a3dbd9d930246' 
  AND token = '5BffLN85Ra1SqzY/lWImtfh7ap8o2wQj0Mf9rBbPRlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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