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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94dcaf16b1d052e8d22eb44a5e234ef147c9578e4064e97d215df9961d8e9f66' 
  AND token = 'HGooZWWhOEXKOi3xLqr82Y2Kl9gjBUE2SRYl05vGkYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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