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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26672cfa5efeda5b0beb1dcf0a0661a2b1797cec069c6fea5b7d7ea4dd91838' 
  AND token = '/c6oEuOveiXdmPlPGWxb9TqibTcO82TfwABE0vgRi1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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