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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ab1e718fb1f68ba5336cedc39a17bb59eb0ff4a23dcadb71f1bc062e308890' 
  AND token = '+XR3Hds0hsq2TDFO1Gv9AhrX/T5Lcw9e2oRx8iJSiAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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