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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb36db769b8e4e0f8fc88ee60042823277ea2c3d7dda7fb1022fac0ad25154ae' 
  AND token = 'gxx4l5qGG7KMQhQ5HgXWHQDJzCYLGKAzzx/eLx13IDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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