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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0baf5127e22b0001c02853b2ca8d792eb9af7d98f60a5a6e8cf5c53e676ffe' 
  AND token = 'w5VxIWh5NyLnzfy+SHJ9k17urTZMGblXDPgkfdvRopE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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