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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76f1b911c2e36b35b206ab4466dad4d1a6d3ae0f161e6ebf383c49d525c4f64' 
  AND token = 'kOZxoys5L8Yyywmj7IbxY15X33SUfxIfyT+J7NS1vSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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