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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5dbd92f6cc6c9db18a398a43dfc378f8a4e64fdf6e78e7c238596e9f4e399a6' 
  AND token = 'tjOLeSEWdlhYpQjDoSCbYVpA7Q3lRweTF/boDVZdu+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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