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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0394db533a50a867bd223d0081b9c37a2b5823e8099b34ee8ce10e99a49806' 
  AND token = '7IRBaizdIjTppiCTwERrFymP7s9MLRvXTbnDYU9b/34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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