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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58a6d37c4391f4ba427e449d7930ab36e12555cc4127a8f021809703e63aef5' 
  AND token = 'H/LiW2yY05CctoZ+CWPF22XVz/pYZenHa1HCYcPftlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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