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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f952c42b11d4eceadaf87060a8c6d880b60ef97c7c89a3707ca40d3d45459bda' 
  AND token = 'NNwLvIpzN4kiTcqhBpouTiQwXDoh62dvf/Pl2BKfmz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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