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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd913bd0fef1510eabc5c17a52ce1161dc845ec73acd0cad3c228123b06e8f323' 
  AND token = 'U+CDsnMuOy8Ld1VS3KTueZbCtvvm42sIyblVj6jF4x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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