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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf80924cc4e41a83b2129f4d2f49f3b5d29f63801f773f3e4c8b931caf0b204e' 
  AND token = 'qWvLukqFqUTr/fRHje6iwOGFbmr+vkuC76el9dwvGtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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