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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9e206ec6595157bddc72d993b5533c082b58356e30c5af33b35e2f5562e2eb' 
  AND token = 'biNz5IsqCg79j3MIUgWMvpNWU4QOgBz4Oa5JbcLl5Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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