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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cd051589c68e3c54834a83eae25d2cef798630778c2759c6b33e2104af382e' 
  AND token = '864/jWlIU6rZ/AF4dVeiumeXQFQysu0nd/Qqj+/LTAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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