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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08556b7ce566ce2751931eb7ac3f23673f92686bdfaf6e5e0f26ce49ca97b780' 
  AND token = '11B1ar8UAcIBfVuYvMfP74cdxoI3w6YbUqJ8CKcVRBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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