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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08435dfc98c9d5aba6482267f2976036b9e5ca285c60206897947083e7a4d424' 
  AND token = '3EqWCl8xSfOXFqBBiLZLYhz85+9U7tXOfj6eQRMb40w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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