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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09fd34d7874fa7de480a802ba6a17427f7d018049d0c3120a974f49ce3a575d9' 
  AND token = '7GX99LVZ6OqeofHe21oG0TrzwFiI4GJf4zewKid6FP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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