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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544170157306a24398bcf701d9d1f9823a368dacd7fff354c23d42d2cf5e89b8' 
  AND token = 'SttB6cOM9cdCQv/+o6EmO4ajSUvLFSD3UqprcqMKtZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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