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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da5f7fc7b34519d5cb0ca55515aaec625412580018b9a127dc1a55b32dc2e59' 
  AND token = 'Mq6ylHfpn1Kf8XvbZxCnBcfirXr0B9EOarbiLTP283A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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