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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d6de1abb377584d4a136d772ae7847181762e972023f6e776b374c99d922dbc' 
  AND token = 'd4FgUjLge8g1vNois8u1BC/LcKFo4Ly8ugH0KMcQFFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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