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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bc0c8dac8b57cd76a71928d674d40e625c6713b4d4e8f35f17a30ac2e61f93' 
  AND token = 'W+Say7BbHf4/AJyKt2WK9acvFdjyQ1rCym6gk5j51nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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