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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e4c7ca4f21057cfaea20013cd1548d972a9e57a0412f7a08da8e116ee1b723' 
  AND token = 'korzvuqAMjBWNT39KbO7gNqkIZBJ5k0o2wDwxYMlnOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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