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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9312f4b26d8a8b6aaa257609f6343e7f456d82cf258111c2b7b72948242e3f6' 
  AND token = '7PbdlRrNUVkFqRYakqfqq3aW5pkdmjxhiHbj1FHt67w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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