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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d469f1d758f375ae3ad15f4cd1e0f6ebcd4d58c321564a98c020c0be41c9c1' 
  AND token = 'ttgiSMreSQHCxoEMf5kRGPmGEp2dNsJH20j8jXHgI68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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