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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15863f46c15072f5de9a6ced8ea035eda7283cac8655cfe68988e7e11cccbf79' 
  AND token = 'rTDxXU8gXiu+wo2BD033uM1x3r0oN09JsNFP1KpImTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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