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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777e164e63f4f4a0d737ff949c398e38bbbcc025d8b0e9d73d05f87b82c89b68' 
  AND token = '3bu/suYLr9eW1NBq/hAjZQrDTm1ZbEpvRtykyhJX+XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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