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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dd427956545a20c79b43f37d9680ffdac8dc25aafac7c86ff9d960c524f5ab' 
  AND token = 'YC49+tgw1X1OZEq4QgXXRzumsSo0s6Z/B7yt3Hq41HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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