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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f6dd94d1b3f962d72f7cd212bf4ff71e928fcbacfb8a3232c888f4cb9dd2cc' 
  AND token = 'uQ+R42PsIYaGN0RgqmffOice3s4KJVH5WIbNGIz24TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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