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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e76ba89294edd07851d04df01dcc8ce7403ebfa1d488ea3b3bede2ec239c7b' 
  AND token = 'CPd69CR4jMf/J19EWoIJv9sYq68covA50IE3/9GnrTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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