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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718831e5cf185f2bcd208bd8e839160cfedc0b8cfee084217e757de5d69a57ba' 
  AND token = 'spU2o9fqBwX2lqNt2fyw9H08Oro1aJ6BkpCOUJgXXVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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