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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af52fa299f53c307c0ce60e2e0f950db39be5b61bbd45526e5c58f241be67555' 
  AND token = 'iRoDHK6JUCk4WzHwpjxuhycb1aWm4G71pHrt3F07cwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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