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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc7ab3b7369169b177b5bbc4d0ce99ee7b1589f55002f4c67d225c15fcfc1f7' 
  AND token = '19t0KjAtyFXSXirbVHdWQZfWt9hXi5lchDl14Q3s688=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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