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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0768552540ab1ac23daa759775b257f85f124c9efc813bc4ca4484632ba411' 
  AND token = 'Rv9BxBFY5tftS1+/En/y+6hm+STqKdtmxEkUhyCSdUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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