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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe28961ad8ccf467f55ef066e00960ec025af75e3fca89c433aeafa78946a62' 
  AND token = 'A9149zsrOoIZwHe7XLYa4CDkroW9e1mrG7VNubSPnwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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