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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76de7a1a72473f6649053d9bd848115c8c9453bb5a343482b5d2fd4059dea32' 
  AND token = 'wQfnc6ZGpl55sg4ZQaZd4ZrxBDdbpqazHmguM9h3ALo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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