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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f2965340bc61aaf8c838b2250666ab3611b313f5df34bc6bff84fe92ca9d94' 
  AND token = 'ehov3vpwQBpnSLmCrhfIiO87vkji1UeDgbo8t70chwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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