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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957e9edb6fcaff3224f5e162231030c3c9e4d489a95af8b814bc97dbe743a758' 
  AND token = 'l25ff5Njuyo7DYQ4QQKNex0geZ+QQiU+ZpVqyZrDHXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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