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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57e947215269fb80d9063230d2e78a2cc000b59fd62c55effd4ef2ef220495e' 
  AND token = 'kmYPoB9/ufEQra0VmZKMgNeBdQcWS7lFJBi16uWF4Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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