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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '748aa8221bf08a1d8ea456d76c7fa030a5e050b4163c4fbaa2d5d39d04e0b34b' 
  AND token = 'JYQA3fwjANBRDFed7qGxKtWOeEmyd/fdWA/53kvYijk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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