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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a217c208d34164d56834ab9c1f27854b5a1b582104ef58ff00f6bfa515c7b934' 
  AND token = 'ETF1amcnf8+zIFodP1mfD/bKloh483ibUHoMLpQOpz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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