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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f067c231c8e620ebd557faf9131be019ac1d1915f342dd82c652f1cb2f643bbd' 
  AND token = 'W5Mr9ck0U003J95ZFi3ellym0XGjcJi/+FTR/xRvNqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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