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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c52ed8a21c9f87ab1b02ac14efcd80fe4971d435d2f36d366c082942f1f4df' 
  AND token = '+CnOMtBTYnQJWn+cfilPBCJiRH6SfSm7qL2xhfADDkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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