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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01439854c4fbd1d8adbe4a3fbf305d86e8701dea92fd8da01d2b2acb3e319962' 
  AND token = '9IKAUy2EwUooor/FRPzMAar+/GyvDoAUE1hz22jEIJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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