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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f450573d86632be8058e6cf40df40ef29cd3fc7e881c6e81fe119ec00c053ba' 
  AND token = 'lks7sqrd3FW9IPzjcTBPKMKy4Gu2/3uIrThjuQVazEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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