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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8c4afd338f6256a3304601e49a88d495de8a70c58f2208f3ae64133e0faab3' 
  AND token = 'zxjXg3XPl5SXIkCyS6lduE1u2aHBfnRVriw1gxLqI1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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